Lumus DK40, the best smartglasses of CES 2014 (pictures)

Ironically, the clearest optics and most impressive use of a personal head-up display comes from one company's prototype for business customers.

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Smartglasses that put optics first

LAS VEGAS -- For the best example of a personal head-up display at CES 2014, look no further than the well-made Lumus DK40. The kicker? A prototype to get creative juices flowing for other device makers, it isn't even meant to sell directly to customers.